Zeta Phi Beta 20 oz Skinny Tumbler • Stainless Steel • Drinkware Stay classy and keep your drinks cold with the Zeta Phi Beta 20 oz Skinny Tumbler. Made of stainless steel, this tumbler features a purse, heels, and the iconic Dove – perfect for any Z Phi B member. Whether you're on the go or relaxing at home, this drinkware is a must-have for any sorority girl.